Physical properties of the WASP-44 planetary system from simultaneous multi-colour photometry
文献类型：期刊论文
| 作者 | Mancini, L.1; Nikolov, N.1; Southworth, J.2; Chen, G.1,3,4; Fortney, J. J.5; Tregloan-Reed, J.2; Ciceri, S.1; van Boekel, R.1; Henning, Th.1 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2013-04-01 |
| 卷号 | 430期号:4页码:2932-2942 |
| ISSN号 | 0035-8711 |
| 关键词 | stars: fundamental parameters stars: individual: WASP-44 planetary systems |
| 通讯作者 | Mancini, L (reprint author), Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany. Email: mancini@mpia-hd.mpg.de |
| 英文摘要 | We present ground-based broad-band photometry of two transits in the WASP-44 planetary system obtained simultaneously through four optical (Sloan g', r', i', z') and three near-infrared (NIR; J, H, K) filters. We achieved low scatters of 1-2 mmag per observation in the optical bands with a cadence of approximate to 48 s, but the NIR-band light curves present much greater scatter. We also observed another transit of WASP-44 b by using a Gunn r filter and telescope defocussing, with a scatter of 0.37 mmag per point and an observing cadence around 135 s. We used these data to improve measurements of the time of mid-transit and the physical properties of the system. In particular, we improved the radius measurements of the star and planet by factors of 3 and 4, respectively. We find that the radius of WASP-44 b is 1.002 +/- 0.033 +/- 0.018 R-Jup (statistical and systematic errors, respectively), which is slightly smaller than previously thought and differs from that expected for a core-free planet. In addition, with the help of a synthetic spectrum, we investigated the theoretically predicted variation of the planetary radius as a function of wavelength, covering the range 370-2440 nm. We can rule out extreme variations at optical wavelengths, but unfortunately our data are not precise enough (especially in the NIR bands) to differentiate between the theoretical spectrum and a radius which does not change with wavelength. |
| 学科主题 | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | TRANSITING EXTRASOLAR PLANETS ; HUBBLE-SPACE-TELESCOPE ; JUPITER HD 209458B ; LIGHT-CURVE PROJECT ; EARTH GJ 1214B ; GIANT PLANETS ; TRANSMISSION SPECTROSCOPY ; HOT-JUPITER ; MU-M ; SHORT-PERIOD |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000318339700036 |
| 公开日期 | 2014-01-08 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/9835]  |
| 专题 | 紫金山天文台_分子云与恒星形成研究团组 |
| 作者单位 | 1.Max Planck Inst Astron, D-69117 Heidelberg, Germany 2.Keele Univ, Astrophys Grp, Newcastle Under Lyme ST5 5BG, Staffs, England 3.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China 4.Key Lab Radio Astron, Nanjing 210008, Peoples R China 5.Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA |
| 推荐引用方式 GB/T 7714 | Mancini, L.,Nikolov, N.,Southworth, J.,et al. Physical properties of the WASP-44 planetary system from simultaneous multi-colour photometry[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,430(4):2932-2942. |
| APA | Mancini, L..,Nikolov, N..,Southworth, J..,Chen, G..,Fortney, J. J..,...&Henning, Th..(2013).Physical properties of the WASP-44 planetary system from simultaneous multi-colour photometry.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,430(4),2932-2942. |
| MLA | Mancini, L.,et al."Physical properties of the WASP-44 planetary system from simultaneous multi-colour photometry".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 430.4(2013):2932-2942. |
入库方式： OAI收割
来源：紫金山天文台
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